What is important to check , does the power supply have the same wattage, and power connectors . Before buying kindly check
1. If you need SATA power cable connection on your new power supply
2. If you need additional power cable connection for the video card

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On the Galaxy display you could see what is the remaining battery life time as calculated by the software. Normally after you replaced the batteries you are supposed to reset this counter using specific software by the manufacturer. According to your information you have replaced the batteries 3 times in 5 years period. This is not normal. Nevertheless since the last replacement in 2008 it appears that the battery are now reaching the end life, which is generally 3-5 years life expectancy.

I would review the following of the assumption that the UPS is fully operational and the charging system is working.

1. Do a load test or a battery impedance test to verify the batteries are good2. I would look at the battery life time specification, whether it is 3-5 years, 5-7 years ect.3. Check the room temperature, every 10 degrees Celcius above 25 deg reduces battery life time by half4. Check the number of power failures/ duration of these power failures and if possible what load were on the UPS at the time of the power failures. I hope this will help. If all verifications are to specifications, then most likely it is a software problem

Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

You didn't include any additional details about your power supply so the reason that it's not working could be one of several.

I assume you're plugging this into your motherboard correctly. Make sure the main connection pins are lined up correctly. In truth, you shouldn't be able to do this incorrectly due to it only allowing it to be inserted in one direction. Another note, you can't just plug it into the wall and expect the fan to go when the circuits aren't complete (i.e testing it outside the computer).

In newer systems that is an additional 4 prong plug wire that needs to be attached to the motherboard, in addition to the 20 prong (the only BIG one) plug

Lastly, power supplies are very cheaply built, so it's also possible it has just died. You didn't mention that it was working originally either, so I don't know if it not working is a new thing.

I usually get a 'good' one (higher wattage, 600-750W or more) and reuse these from system to sytem. What's a good one? Well, that's up for discussion, but one that feels heavier, has detachable cables, and dual 12v rails. These are the features I like to see. The higher initial investment easily pays for itself over the longer lifetime.

MGE Pulsar 3000 is an online UPS. try to check the battery first if its ok. coz for an online UPS it will need to have a good working UPS battery to trigger the switching relays to on the online UPS unlike backups UPS that can be turn on without any batteries